Download Nanomaterials

Nanomaterials
Done by: Guan Ruofei 3P3 (6)
Content
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What are nanomaterials?
Carbon nanotube
Nano copper
Nano silver
References
What are nanomaterials?
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Nanomaterials is a field which takes a
materials science-based approach to
nanotechnology. It studies materials with
morphological features on the nanoscale, and
especially those which have special
properties stemming from their nanoscale
dimensions.
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Nanoscale is usually defined as smaller than
a one tenth of a micrometer in at least one
dimension
Carbon nanotube
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Carbon nanotubes (CNTs) are allotropes of
carbon with a cylindrical nanostructure.
Nanotubes have been constructed with
length-to-diameter ratio of up to
132,000,000:1, which is significantly larger
than any other material.
Uses of carbon nanotube
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These cylindrical carbon molecules have novel
properties that make them potentially useful in
many applications in nanotechnology,
electronics, optics and other fields of materials
science, as well as potential uses in architectural
fields. They exhibit extraordinary strength and
unique electrical properties, and are efficient
thermal conductors.
Limitation of carbon nanotube
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Their final usage, however, may be limited by
their potential toxicity and controlling their
property changes in response to chemical
treatment.
Nano copper
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Copper nanoparticles smaller than 50 nm are
considered super hard materials that do not
exhibit the same malleability and ductility as
bulk copper.
Uses of nano copper
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It is an ideal medicament in the prevention
and treatment of osteoporosis, primary and
secondary osteoporosis, and fracture
resulted from osteoporosis, its curative effect
is definite, and there is little toxic and side
effect.
Nano silver
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Silver nanoparticles are nanoparticles of
silver, i.e. silver particles of between 1 nm
and 100 nm in size. While frequently
described as being 'silver' some are
composed of a large percentage of silver
oxide due to their large ratio of surface to
bulk silver atoms.
Uses of nano silver
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Appliances such as refrigerator or air
conditioner with silver nano coating to their
inner surfaces for can gain an overall antibacterial and anti-fungal effect. As air
circulates, the coated surfaces contact with
the silver ions which can resist any airborne
bacteria, which in turn suppress the
respiration of bacteria, adversely affects
bacteria's cellular metabolism and inhibits cell
growth.
Uses of nano silver
There is an effort to incorporate silver nanoparticles
into a wide range of medical devices:
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bone cement
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surgical instruments,
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surgical masks,
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wound dressings.
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treatment of HIV-1.
Difference between nano-silver
and colloidal silver
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The primary benefit of nano silver, as
opposed to other colloidal silver preparations,
is increased surface area of the smaller
particles, which boosts their reactivity.
Perhaps even more importantly, the small
size of the particles prevents them from
becoming lodged in internal tissue, and
creating toxicity or discoloration.
Food for thought
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It is often claimed that nano silver has
beneficial effects on the human immune
system . While it's true that most people who
take nano silver report improved health and
strong immune function, the direct connection
between nano silver and the immune system
remains elusive. It is likely, instead, that the
silver particles reduce the workload of the
immune system by combating bacteria and
viruses the body's natural defenses would
otherwise have to confront.
References
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http://en.wikipedia.org/wiki/Carbon_nanotube
http://www.advanceddynamics-usa.com/xue_files/image004.jpg
http://en.wikipedia.org/wiki/Silver_Nano
http://www.nanobiosilver.com/images/silvert2-ellectronsmall.jpg
http://www.ehow.com/facts_5009003_advantages-nano-silvertreatment-aids.html
http://en.wikipedia.org/wiki/File:C60_Buckyball.gif
http://en.wikipedia.org/wiki/Silver_nanoparticles
http://thetechnologicalcitizen.com/wpcontent/uploads/2010/01/Question.jpg
http://www.sumobrain.com/patents/wipo/Use-nano-copperpowder-in/WO2004067016.html